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Centre-to-limb variations in coronal hole and quiet sun regions obtained with IRIS spectroscopic observations

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)

The centre-to-limb variation of non-thermal velocities using IRIS Si iv

Yamini K. Rao et al.

Summary: In this study, we investigated the non-thermal velocities in the quiet Sun using high-resolution observations from IRIS. Our findings suggest a variation in velocities from the center to the limb, with lower velocities observed on the disc compared to previous observations.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2022)

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Article Astronomy & Astrophysics

Quiet-Sun Mg ii h and k Line Profiles Derived from IRIS Full-Sun Mosaics. I. Reference Profiles and Center-to-limb Variation

Stanislav Gunar et al.

Summary: This study derived high-precision reference profiles of Mg ii h and k lines representing the quiet Sun during a minimum of solar activity using IRIS full-Sun mosaics. These reference profiles can serve as incident radiation boundary conditions for studying prominences, spicules, and other coronal and chromospheric structures.

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES (2021)

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Article Astronomy & Astrophysics